Port filestorage support with sqlite

[Dimitar Misev]

Enable rasserver to use sqlite instead of postgresql. Postgresql is still needed however by petascope and rasimport.

To use sqlite instead of postgresql, use

./configure ... --with-default-basedb=sqlite

In rasmgr.conf the connect string should be an absolute path to the RASBASE database, which should normally be `$RMANHOME/data/RASBASE (automatically used in the create_db.sh script), e.g.

define dbh rasdaman_host -connect /path/rasdaman_install/data/RASBASE

The directory where the database and BLOB files are stored is normally $RMANHOME/data/RASBASE.

The default directory where the BLOB files are stored can be changed

• by a ./configure parameter --with-filedatadir=PATH
• by setting an environment variable RASDATA

[Dimitar Misev]

patch submitted.